3 years ago

What is the mass number of an atom equal to?

Chemistry

1 answer:

PolarNik [594]3 years ago

7 0

Answer:

number of protons plus the number of electrons in an atom

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When the equation Ca(OH)2 + HBr → (products) is completed and balanced, one term in the equation will be

NISA [10]

<span>Answer for the given question is CaBr2. Although, the given equation requires balancing of by adding one more HBr and one more H2o in resultant. The given equation will product at least one CaBr2. Hence the answer for the given equation is Calcium bromide i.e. CaBr2.</span>

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3 years ago

Which statement describes a chemical property of

wel

everything describes physical traits ect. and 3 explains reactions with a different substance so 3

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A certain shade of blue has a frequency of 7.18 × 1014 Hz. What is the energy of exactly one photon of this light?

timurjin [86]

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3 years ago

What would you multiply "grams of barium" by to get the units "moles of barium" ?

solmaris [256]

Moles = weight in grams / molecular weight.

So I would divide the "grams of barium" by its molecular weight (which is 137.3) to get "moles of barium". :)

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3 years ago

What is the volume of 5.8g of H2?

BartSMP [9]

At standard temperature and pressure, one mole of gas occupies 22.4 L. Knowing this, we must convert the grams to moles and moles to liters to get your answer. Here's how you do it!
$\frac{5.8gH2}{1} | \frac{1moleH2}{2.0gH2}| \frac{22.4LH2}{1moleH2} \\ \frac{5.8*1*22.4LH2}{2.0} \\ \frac{129.92LH2}{2.0} \\ 64.96LH2 \\ 65LH2$
With significant figures accounted for, 5.8 grams of hydrogen gas occupies 65 L.

Hope this helps!

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4 years ago